@inproceedings{jan1980on,
title={On the analytic continuation of holomorphic solutions of partial differential equations},
author={Jan Persson},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203510303669350},
booktitle={Arkiv for Matematik},
volume={19},
number={1},
pages={177-191},
year={1980},
}
Jan Persson. On the analytic continuation of holomorphic solutions of partial differential equations. 1980. Vol. 19. In Arkiv for Matematik. pp.177-191. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203510303669350.